The FHLMC was created in 1970 to expand the secondary market for mortgages in the US. Along with Fannie Mae, Freddie Mac buys mortgages on the secondary market, pools them, and sells them as a mortgage-backed security to investors on the open market. This secondary mortgage market increases the supply of money available for mortgage lending and increases the money available for new home purchases. The name, "Freddie Mac", is a variant of the initialism of the company's full name that had been adopted officially for ease of identification.

Moody's gave Freddie Mac's preferred stock an investment grade rating of A1 until August 22, 2008, when Warren Buffett said publicly that both Freddie Mac and Fannie Mae had tried to attract him and others. Moody's changed the credit rating on that day to Baa3, the lowest investment grade credit rating. Freddie's senior debt credit rating remains Aaa/AAA from each of the major ratings agencies Moody's, S&P, and Fitch.[7]

As of the start of the conservatorship, the United States Department of the Treasury had contracted to acquire US$1 billion in Freddie Mac senior preferred stock, paying at a rate of 10% per year, and the total investment may subsequently rise to as much as US$100 billion.[8]

Home loan interest rates may go down as a result and owners of Freddie Mac debt and the Asian central banks who had increased their holdings in these bonds may be protected. Shares of Freddie Mac stock, however, plummeted to about one U.S. dollar on September 8, 2008, and dropped a further 50% on June 16, 2010, when the Federal Housing Finance Agency ordered the stocks delisted.[9] In 2008, the yield on U.S Treasury securities rose in anticipation of increased U.S. federal debt.[10]

From 1938 to 1968, the Federal National Mortgage Association (Fannie Mae) was the sole institution that bought mortgages from depository institutions, principally savings and loan associations, which encouraged more mortgage lending and effectively insured the value of mortgages by the US government. In 1968, Fannie Mae split into a private corporation and a publicly financed institution. The private corporation was still called Fannie Mae and its charter continued to support the purchase of mortgages from savings and loan associations and other depository institutions, but without an explicit insurance policy that guaranteed the value of the mortgages. The publicly financed institution was named the Government National Mortgage Association (Ginnie Mae) and it explicitly guaranteed the repayments of securities backed by mortgages made to government employees or veterans (the mortgages themselves were also guaranteed by other government organizations).

To provide competition for the newly private Fannie Mae and to further increase the availability of funds to finance mortgages and home ownership, Congress then established the Federal Home Loan Mortgage Corporation (Freddie Mac) as a private corporation through the Emergency Home Finance Act of 1970. The charter of Freddie Mac was essentially the same as Fannie Mae's newly private charter: to expand the secondary market for mortgages and mortgage backed securities by buying mortgages made by savings and loan associations and other depository institutions. Initially, Freddie Mac was owned by the Federal Home Loan Bank System and governed by the Federal Home Loan Bank Board.

Freddie Mac's primary method of making money is by charging a guarantee fee on loans that it has purchased and securitized into mortgage-backed security (MBS) bonds. Investors, or purchasers of Freddie Mac MBS, are willing to let Freddie Mac keep this fee in exchange for assuming the credit risk, that is, Freddie Mac's guarantee that the principal and interest on the underlying loan will be paid back regardless of whether the borrower actually repays. Because of Freddie Mac's financial guarantee, these MBS are particularly attractive to investors and, like other Agency MBS, are eligible to be traded in the "to-be-announced," or "TBA" market.[12]

The GSEs are allowed to buy only conforming loans, which limits secondary market demand for non-conforming loans. The relationship between supply and demand typically renders the non-conforming loan harder to sell (fewer competing buyers); thus it would cost the consumer more (typically 1/4 to 1/2 of a percentage point, and sometimes more, depending on credit market conditions). OFHEO, now merged into the new FHFA, annually sets the limit of the size of a conforming loan in response to the October to October change in mean home price. Above the conforming loan limit, a mortgage is considered a jumbo loan. The conforming loan limit is 50 percent higher in such high-cost areas as Alaska, Hawaii, Guam and the US Virgin Islands,[13] and is also higher for 2–4 unit properties on a graduating scale. Modifications to these limits were made temporarily to respond to the housing crisis, see Jumbo loan for recent events.

The FHLMC states, "securities, including any interest, are not guaranteed by, and are not debts or obligations of, the United States or any agency or instrumentality of the United States other than Freddie Mac."[14] The FHLMC and FHLMC securities are not funded or protected by the US Government. FHLMC securities carry no government guarantee of being repaid. This is explicitly stated in the law that authorizes GSEs, on the securities themselves, and in public communications issued by the FHLMC.

There is a widespread belief that FHLMC securities are backed by some sort of implied federal guarantee and a majority of investors believe that the government would prevent a disastrous default. Vernon L. Smith, 2002 Nobel Laureate in economics, has called FHLMC and FNMA "implicitly taxpayer-backed agencies." [15] The Economist has referred to "the implicit government guarantee"[16] of FHLMC and FNMA.

The then-director of the Congressional Budget Office, Dan L. Crippen, testified before Congress in 2001, that the "debt and mortgage-backed securities of GSEs are more valuable to investors than similar private securities because of the perception of a government guarantee."[17]

The FHLMC receives no direct federal government aid. However, the corporation and the securities it issues are thought to benefit from government subsidies. The Congressional Budget Office writes, "There have been no federal appropriations for cash payments or guarantee subsidies. But in the place of federal funds the government provides considerable unpriced benefits to the enterprises. Government-sponsored enterprises are costly to the government and taxpayers. The benefit is currently worth $6.5 billion annually." [18]

As mortgage originators began to distribute more and more of their loans through private label MBS, GSEs lost the ability to monitor and control mortgage originators. Competition between the GSEs and private securitizers for loans further undermined GSEs power and strengthened mortgage originators. This contributed to a decline in underwriting standards and was a major cause of the financial crisis.[19]

Investment bank securitizers were more willing to securitize risky loans because they generally retained minimal risk. Whereas the GSEs guaranteed the performance of their MBS, private securitizers generally did not, and might only retain a thin slice of risk.[19] Often, banks would offload this risk to insurance companies or other counterparties through credit default swaps, making their actual risk exposures extremely difficult for investors and creditors to discern.[20]

From 2001-2003, financial institutions experienced high earnings due to an unprecedented re-financing boom brought about by historically low interest rates. When interest rates eventually rose, financial institutions sought to maintain their elevated earnings levels with a shift toward riskier mortgages and private label MBS distribution. Earnings depended on volume, so maintaining elevated earnings levels necessitated expanding the borrower pool using lower underwriting standards and new products that the GSEs would not (initially) securitize. Thus, the shift away from GSE securitization to private-label securitization (PLS) also corresponded with a shift in mortgage product type, from traditional, amortizing, fixed-rate mortgages (FRMs) to nontraditional, structurally riskier, nonamortizing, adjustable-rate mortgages (ARMs), and in the start of a sharp deterioration in mortgage underwriting standards.[21] The growth of PLS, however, forced the GSEs to lower their underwriting standards in an attempt to reclaim lost market share to please their private shareholders. Shareholder pressure pushed the GSEs into competition with PLS for market share, and the GSEs loosened their guarantee business underwriting standards in order to compete. In contrast, the wholly public FHA/Ginnie Mae maintained their underwriting standards and instead ceded market share.[21]

The growth of private-label securitization and lack of regulation in this part of the market resulted in the oversupply of underpriced housing finance[21] that led, in 2006, to an increasing number of borrowers, often with poor credit, who were unable to pay their mortgages—particularly with adjustable rate mortgages (ARM)—caused a precipitous increase in home foreclosures. As a result, home prices declined as increasing foreclosures added to the already large inventory of homes and stricter lending standards made it more and more difficult for borrowers to get mortgages. This depreciation in home prices led to growing losses for the GSEs, which back the majority of US mortgages. In July 2008, the government attempted to ease market fears by reiterating their view that "Fannie Mae and Freddie Mac play a central role in the US housing finance system". The U.S. Treasury Department and the Federal Reserve took steps to bolster confidence in the corporations, including granting both corporations access to Federal Reserve low-interest loans (at similar rates as commercial banks) and removing the prohibition on the Treasury Department to purchase the GSEs' stock. Despite these efforts, by August 2008, shares of both Fannie Mae and Freddie Mac had tumbled more than 90% from their one-year prior levels.

In 2003, Freddie Mac revealed that it had understated earnings by almost $5 billion, one of the largest corporate restatements in U.S. history. As a result, in November, it was fined $125 million—an amount called "peanuts" by Forbes.[23]

On April 18, 2006, Freddie Mac was fined $3.8 million, by far the largest amount ever assessed by the Federal Election Commission, as a result of illegal campaign contributions. Freddie Mac was accused of illegally using corporate resources between 2000 and 2003 for 85 fundraisers that collected about $1.7 million for federal candidates. Much of the illegal fund raising benefited members of the House Financial Services Committee, a panel whose decisions can affect Freddie Mac. Notably, Freddie Mac held more than 40 fundraisers for House Financial Services Chairman Michael Oxley, R-Ohio.[24]

Both Fannie Mae and Freddie Mac often benefited from an implied guarantee of fitness equivalent to truly federally backed financial groups.[25]

As of 2008, Fannie Mae and Freddie Mac owned or guaranteed about half of the U.S.'s $12 trillion mortgage market.[26] This made both corporations highly susceptible to the subprime mortgage crisis of that year. Ultimately, in July 2008, the speculation was made reality, when the US government took action to prevent the collapse of both corporations. The US Treasury Department and the Federal Reserve took several steps to bolster confidence in the corporations, including extending credit limits, granting both corporations access to Federal Reserve low-interest loans (at similar rates as commercial banks), and potentially allowing the Treasury Department to own stock.[27] This event also renewed calls for stronger regulation of GSEs by the government.

President Bush recommended a significant regulatory overhaul of the housing finance industry in 2003, but many Democrats opposed his plan, fearing that tighter regulation could greatly reduce financing for low-income housing, both low- and high-risk.[28] Bush opposed two other acts of legislation:[29][30] Senate Bill S. 190, the Federal Housing Enterprise Regulatory Reform Act of 2005, which was introduced in the Senate on January 26, 2005, sponsored by Senator Chuck Hagel and co-sponsored by Senators Elizabeth Dole and John Sununu. S. 190 was reported out of the Senate Banking Committee on July 28, 2005, but never voted on by the full Senate.

On May 25, 2006, Senator McCain joined as a co-sponsor to the Federal Housing Enterprise Regulatory Reform Act of 2005 (first put forward by Sen. Charles Hagel [R-NE])[32] where he pointed out that Fannie Mae and Freddie Mac's regulator reported that profits were "illusions deliberately and systematically created by the company's senior management".[33] However, this regulation too met with opposition from both Democrats and Republicans.[34]

Several executives of Fannie Mae or Freddie Mac include Kenneth Duberstein, former Chief of Staff to President Reagan, advisor to John McCain's Presidential Campaign in 2000, and President George W. Bush's transition team leader (Fannie Mae board member 1998–2007);[35] Franklin Raines, former Budget Director for President Clinton, CEO from 1999 to 2004—statements about his role as an advisor to the Obama presidential campaign have been determined to be false;[36] James Johnson, former aide to Democratic Vice-President Walter Mondale and ex-head of Obama's Vice-Presidential Selection Committee, CEO from 1991 to 1998; and Jamie Gorelick, former Deputy Attorney General to President Clinton, and Vice-Chairman from 1998 to 2003. In his position, Johnson earned an estimated $21 million; Raines earned an estimated $90 million; and Gorelick earned an estimated $26 million.[37] Three of these four top executives were also involved in mortgage-related financial scandals.[38][39]

The top 10 recipients of campaign contributions from Freddie Mac and Fannie Mae during the 1989 to 2008 time period include 5 Republicans and 5 Democrats. Top recipients of PAC money from these organizations include Roy Blunt (R-MO) $78,500 (total including individuals' contributions $96,950), Robert Bennett (R-UT) $71,499 (total $107,999), Spencer Bachus (R-AL) $70,500 (total $103,300), and Kit Bond (R-MO) $95,400 (total $64,000). The following Democrats received mostly individual contributions from employees, rather than PAC money: Christopher Dodd, (D-CT) $116,900 (but also $48,000 from the PACs), John Kerry, (D-MA) $109,000 ($2,000 from PACs), Barack Obama, (D-IL) $120,349 (only $6,000 from the PACs), Hillary Clinton, (D-NY) $68,050 (only $8,000 from PACs).[40] John McCain received $21,550 from these GSEs during this time, mostly individual money.[41] Freddie Mac also contributed $250,000 to the 2008 Republican National Convention in St. Paul, Minnesota according to FEC filings.[42] The organizers of the Democratic National Convention have not yet submitted their filings on how much they received from Freddie Mac and Fannie Mae.[42]

On Oct 21, 2010 government estimates revealed that the bailout of Freddie Mac and Fannie Mae will likely cost taxpayers $154 billion.[43]

On September 7, 2008, Federal Housing Finance Agency (FHFA) Director James B. Lockhart III announced pursuant to the financial analysis, assessments and statutory authority of the FHFA, he had placed Fannie Mae and Freddie Mac under the conservatorship of the FHFA. FHFA has stated that there are no plans to liquidate the company.[4][5]

The announcement followed reports two days earlier that the Federal government was planning to take over Fannie Mae and Freddie Mac and had met with their CEOs on short notice.[44][45][46]

Under the reported plan, the federal government, via the FHFA, would place the two firms into conservatorship and for each entity, dismiss the chief executive officer, the present board of directors, elect a new board of directors, and cause to be issued new common stock to the federal government. The value of the common stock to pre-conservatorship holders would be greatly diminished, in the effort to maintain the value of company debt and of mortgage-backed securities.[6][44][45][46]

The authority of the U.S. Treasury to advance funds for the purpose of stabilizing Fannie Mae or Freddie Mac is limited only by the amount of debt that the entire federal government is permitted by law to commit to. The July 30, 2008, law enabling expanded regulatory authority over Fannie Mae and Freddie Mac increased the national debt ceiling by US$800 billion, to a total of US$ 10.7 trillion in anticipation of the potential need for the Treasury to have the flexibility to support the federal home loan banks.[47][48][49]

On September 7, 2008, the U.S. Government took control of both Fannie Mae and Freddie Mac. Daniel Mudd, CEO of Fannie Mae and Richard Syron, CEO of Freddie Mac have been replaced. Herbert M. Allison former vice chairman of Merrill Lynch will take over Fannie Mae, and David M Moffett, former vice chairman of US Bancorp, will take over Freddie Mac.[citation needed]